The Toshougu Shrine from Nikko is one of the most crowded tourist attractions I have seen in Japan, so I have a small tip for you: if you plan to take photos, go there as early as possible. Since the shrine opens at 8AM, if you come from Tokyo, the first Spacia limited express train arrives at Nikko at 9:16.
It leaves Asakusa Tobu Station at 7:30, and, even if it’s quite early in the morning, I suggest you to take it, because when the tourist buses start to arrive, the place will look like this: